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- W2036434185 abstract "A competitive enzyme-linked immunosorbent assay (ELISA) for the measurement of metallothionein (MT) in tissues and body fluids has been developed. The ELISA employs the IgG fraction of a rabbit antiserum to rat liver Cd-MT-2 polymer, a biotinylated secondary antibody, and peroxidase conjugated avidin. With a 1:4000 dilution of the immunoglobulins, typical standard curves (logit-log regression) provide a linear range of 0.1–100 ng for MT-2 and 10–1000 ng for MT-1. Fifty percent inhibition is accomplished with 15 ng and 250 ng for MT-2 and MT-1, respectively. Rat liver MT-1 and MT-2 containing different metals (Ag, Cu, and Zn) inhibited the antibodies as effectively as CdMT. However, the antibodies exhibited greater affinity for both Apo-MT isoforms. Previously reported discrepancies between results obtained by metal binding assays (e.g., Ag-hem binding) and radioimmunoassay for MT levels in tissues have been largely resolved. By addition of 1% Tween 20 to samples, the ELISA routinely estimated the total MT in samples of rat, mouse, and human liver and kidney at 88% of the value obtained by the silver-hem binding assay. Specific antibodies to MT-2 were purified from our anti-serum by affinity purification using CH-Sepharose 4B coupled with rat liver MT-1. Estimation of MT in samples using purified MT-2 antibodies provided slightly lower values (72%) for MT in tissues as compared to the Ag-hem method. The predominant form of MT in tissues of control animals was found to be MT-2. Therefore, the MT-2 specific antibodies may be useful for the study of the functions of MT isoforms. Levels of total MT in tissues and biological fluids of rats injected with CdCl2 (0.3 mg Cd/kg) and Cd-MT (0.3 mg Cd/kg) were estimated by ELISA. The results suggest urinary MT levels may be related to kidney damage." @default.
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- W2036434185 date "1992-01-01" @default.
- W2036434185 modified "2023-09-23" @default.
- W2036434185 title "Heterogeneity of antibodies to metallothionein isomers and development of a simple enzyme-linked immunosorbent assay" @default.
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- W2036434185 doi "https://doi.org/10.1002/jbt.2570070405" @default.
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